Create secure human-in-the-loop approval flows with Postgres and Telegram

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

Human in the Loop Approval Flow (n8n + Postgres + Telegram) Who’s it for Teams that need a manager approval step before a ticket or request can change status. Great for internal ops, IT reque...

Best for

Ticket Management automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.webhook, n8n-nodes-base.code, n8n-nodes-base.postgres, n8n-nodes-base.if, n8n-nodes-base.telegram, n8n-nodes-base.switch, n8n-nodes-base.stickynote

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Mohammad.

Original n8n.io source

1.1 Workflow description

Title: Create secure human-in-the-loop approval flows with Postgres and Telegram
Workflow name: Create secure human-in-the-loop approval flows with Postgres and Telegram

🔐 Human-in-the-Loop Approval Flow (n8n + Postgres + Telegram)

👥 Who’s it for

Teams that need a manager approval step before a ticket or request can change status. Great for internal ops, IT requests, or any workflow where “a human must sign off.”

⚡ What it does

📨 Manager receives approval/reject link
🔑 Link is signed with HMAC + expiry (secure & tamper-proof)
🗄️ Postgres updates the ticket status
📝 Audit trail records every decision
📲 Telegram notifies both manager and requester
⏰ Expired or invalid links trigger alerts and logs

🛠 Requirements

n8n instance (self-hosted)
Postgres database (with tickets, ticket_audit, workflow_errors)
Telegram bot token
One environment variable set: SECRET_KEY

⚙️ How to set up

Set SECRET_KEY in .env
Create Postgres tables (SQL provided)
Add Telegram + Postgres credentials in n8n
Import the workflow JSON
Test by opening an approval/reject link in your browser

🎨 How to customize

Change who the “manager” is (currently hardcoded in the Code node).
Swap Telegram for Slack or email notifications.
Extend the audit schema to include more metadata (IP, username).

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - 01 Webhook Trigger: Approval Decision

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2.1

Block 2 - 02 FN: Verify Signature + TTL

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 3 - 04c DB: Update Ticket Status

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 4 - 04c1 DB: Get Ticket Owner

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 5 - 04c1a IF: Resolved or In Progress

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 6 - 05c1a Telegram: Notify Resolved

Type / Role: n8n-nodes-base.telegram - telegram
Config choices: Version 1.2

Block 7 - 05c1b Telegram: Notify In Progress

Type / Role: n8n-nodes-base.telegram - telegram
Config choices: Version 1.2

Block 8 - 05c Telegram: Update Confirmation

Type / Role: n8n-nodes-base.telegram - telegram
Config choices: Version 1.2

Block 9 - Notify Failed?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 10 - Execute a SQL query

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 11 - 04c2 DB: Insert Audit Row

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 12 - Text (reject)

Type / Role: n8n-nodes-base.telegram - telegram
Config choices: Version 1.2

Block 13 - 04r0 DB: Get Ticket ID

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 14 - Execute a SQL query1

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 15 - If Resolved

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 16 - If in_progress

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 17 - Actions

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3.2

Block 18 - 04e DB: Insert Audit Expired

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 19 - 04i DB: Insert Audit Invalid

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 20 - 05e Telegram: Notify Expired

Type / Role: n8n-nodes-base.telegram - telegram
Config choices: Version 1.2

Block 21 - 05i Telegram: Alert Invalid

Type / Role: n8n-nodes-base.telegram - telegram
Config choices: Version 1.2

Block 22 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 23 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 24 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Showing the first 24 of 26 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Create secure human-in-the-loop approval flows with Postgres and Telegram
Complexity	advanced
Nodes	26
Categories	Ticket Management
Author	Mohammad
Published	28 Sept 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/9039/9039.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Ticket Management workflows

Frequently asked questions

What does Create secure human-in-the-loop approval flows with Postgres and Telegram do?

Human in the Loop Approval Flow (n8n + Postgres + Telegram) Who’s it for Teams that need a manager approval step before a ticket or request can change status. Great for internal ops, IT reque...

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Ticket Management use case.

Mohammad

2 workflows

Nodes

n8n-nodes-base.webhook n8n-nodes-base.code n8n-nodes-base.postgres n8n-nodes-base.if n8n-nodes-base.telegram n8n-nodes-base.switch n8n-nodes-base.stickynote

Complexity

advanced

Published 28 Sept 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/9039/9039.json

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Create secure human-in-the-loop approval flows with Postgres and Telegram

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

🔐 Human-in-the-Loop Approval Flow (n8n + Postgres + Telegram)

👥 Who’s it for

⚡ What it does

🛠 Requirements

⚙️ How to set up

🎨 How to customize

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - 01 Webhook Trigger: Approval Decision

Block 2 - 02 FN: Verify Signature + TTL

Block 3 - 04c DB: Update Ticket Status

Block 4 - 04c1 DB: Get Ticket Owner

Block 5 - 04c1a IF: Resolved or In Progress

Block 6 - 05c1a Telegram: Notify Resolved

Block 7 - 05c1b Telegram: Notify In Progress

Block 8 - 05c Telegram: Update Confirmation

Block 9 - Notify Failed?

Block 10 - Execute a SQL query

Block 11 - 04c2 DB: Insert Audit Row

Block 12 - Text (reject)

Block 13 - 04r0 DB: Get Ticket ID

Block 14 - Execute a SQL query1

Block 15 - If Resolved

Block 16 - If in_progress

Block 17 - Actions

Block 18 - 04e DB: Insert Audit Expired

Block 19 - 04i DB: Insert Audit Invalid

Block 20 - 05e Telegram: Notify Expired

Block 21 - 05i Telegram: Alert Invalid

Block 22 - Sticky Note

Block 23 - Sticky Note1

Block 24 - Sticky Note2

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions